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402 



DB. F. BUCHANAN WHITE 8 



Consequently the proper position of a number of specimens must 

 remain doubtful. 



That Salioc nigricans hybridizes with Caprea and cinerea is ad- 

 mitted by all salicologists ; but hybrids with aurita have been 

 denied by some, though it seems certain that they exist. Since, 

 then, nigricans crosses with these three Caprece, it seems but 

 reasonable to suppose that phylicifolia should form analogous 

 hybrids. Salicologists, however, allow only one such compound 





namely with Caprea. There occur in Britain, however, some 

 willows which seem to show more or less distinctly the hybrid- 

 ization of phylicifolia with cinerea and aurita. 



X Salix laubina, 8m. (8. phylicifolia X 8. Caprea.) 



X Salix "Waediana (Leefe, MS.), n. hybr. (S. phylicifolia 

 X S. cinerea.) 



X Salix ludipicatts, n. hybr. (S. phylicifolia x S. aurita.) 

 X Salix tephrocabpa, Wimm. (8. phylicifolia X 8. cinerea 



X 8. Caprea.) 



X Salix laurina. 



Regarding the position and limits of 8. laurina, there has been 

 much disparity of opinion. Whilst Borrer and "W. J. Hooker 



W 



S. tenuior, Borr., and S. tenuifolia 



ifolia 



varieties of it. Leefe thought that it could not be satisfactorily 

 distinguished from 8. phylicifolia, of which species Babington con- 

 siders it as a variety. Boswell-Syme gives it as intermediate, and 

 J. D. Hooker as a hybrid between 8. phylicifolia and S. Caprea. 



Andersson and AVimmer, on the other hand, have no doubt that 

 it is a hybrid between phylicifolia and Caprea ; though Wimmer 

 says that, on account of the uniformity of the specimens which 

 he had seen from various parts of Continental Europe, it is a 

 question whether it should not be considered to be a distinct 

 species,and not a hybrid. This constancy of form, he thinks,is due, 

 however, to the fact that probably all the specimens have been 

 cultivated from an English stock. I have seen too few European 

 examples to venture to endorse Wimmer's opinion; but the 

 British plants which have been referred to S. laurina are by no 



means uniform in their characters; and to this 



is 



probably 



botanists. This 









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